Bit



f Patented Julio; 1926; r i 7 Application filed July 2,

This invention relates to wood-boring tools and is intended'more particularly for the use of plumbers and' steam fitters in.

forming theopenings'through fioorsfor the passage of pipes. It-is now the general practice to fOIm SUChOPGIHDgS2.13:3, single operation by the use of expansion bits which clean andfre'e from splintered walls. One 2 comprise a boring idri'll and a radially disposed cutter bar carried by the shank ofthe 'drill and projecting laterally therefrom so that theidri'll bores aninitialiopening and the cutter bar enlarges or expands the opening bycutting away the'wood immediately surrounding the initial opening. This op eration is very laborious *and frequently causes 'chipping'of the wood because the cuttingiproceeds v'ery"slowly and the cutter bar fails to engage .the woodevenly so as to V work steadily; It is, therefore, the objectof-l my invention to provide a simple and inex- -pensivetool whereby-therequired openingf maybe expeditiously formed withminimum labor and the completed opening will be embodiment of my invention is illustrated in the accompanying drawing and will b e'hereinafter fully set forth, thenovel'features being particularly pointed out in the appended t I j I the outer extremity of the sam'e'tozthe inner end thereof to produce a shearing out which fiwill in'inimize the'strain upon the tool and lessen the labor needed to turn it. It will claims.

In the drawing; I z Figure 1 is aside elevationof-my 1ml proved tool showingthe same applied at a pointwhere an opening is" to be formed; Q Fig. 2 is a diametricalsection ofthe working part of the tool;; '1'

Fig. 8 is i an elevation taken at a right angle to Fig. 1 with'the cutter bar-in 'sectiojn on-the line 33 of-Fig. 2; g p e Fig. 4 is a detail section of the cutter on the line 4"l of Fig. 2, and r Fig. 5 is an elevation showing a. slight modification.

The tool embodying my inyention com prises a shank -1 constructed at lts upper end with a tapered angular portion 2 adapted to fit within and be's'ecu'red in the socket of an' ordinary brace. The opposite'end of the shank is preferably expanded and formed I into a substantially cylindrical headi3, the

lower portion of which is exteriorly thread 3 ed, as shown at 4. Upon one diameter of the head'3 an opening 15 "is formed 'therethrough and the wa llfof said opening is m. Serial 'No. 723,779. w

' 2. Upon the axisof the head and opening 6 is formed extendingfrom the diametrical passage5to the lower extremity ofthe head 'and'withinthis opening or bore 6 is engaged a-- set screw orf'bolt Zr The cutter'baricorm prises a cylindrical stock or base member 8 of a diameter slightlyles's than the diameter 7 of the opening 5 so thatlit may beeasily insert'ed in said opening, and-this base member or stock hasits' circumferential surface" dis= posed angularly withrespect to its ends $01 65 that it will'-conform to" the inclination of the wall offth'e openingf5 ,-'onesideof the cylim 5 dricalstock being flat for-engagementwith the set screw as to prevent rotationjof the cutterwithin the bore 6', as best shownin F'ig. 3' 'of-the drawing From the base por-' tion 8, theicutter extends laterally in the form of a bari9 having its upper surface' beveled downwardly and forwardly, as shown" at 10, whereby to meet itsundersur- F facell infasharp cutting edge 12." Itwill bi -readily 'notedithat' the bar 9 is slightly inclinediso that the outer extremityfofits I cutting edge 12 will engage the floor 13 beI-L fore theinner end thereof engages the latter and the engagement of the cutting edge with the floor willproceed progressively from also be noted more particularlyupon reference to 4 t h /underside 11 0f the 5 bar is" inclined slightly upwardly and r'ear sharpenedso that it will readily penetrate the floor and easily cut through the same as the tool is rotated.

' In boring through a floor or other wooden member to provide an opening n which. a steam, water or other plpemay be fitted, the

workman will takethe ordinary straight boring dri'll or auger and cutacircular opening'through the floor of the samegdiameter as the head 3 of my tool. The auger. f

is then withdrawn and my tool substituted therefore infthe brac'ev The-end of the head preferably inclined, as shown clearly-inFig. .3 isthen inserted'in the o ening indicated alined with the axis of the opening and also serving to feed the tool through the opening as it is rotated. The labor of turning the tool and forming the finished hole is thus very materially reduced. The tool may be rotated somewhat rapidly until the cutting tooth 14: meets the surface of. the floor when,..

of course, it will be rotated more slowly in order thatthe. tooth may penetrate the floor and. cut through the same to define a circle having-the same diameter as that desired for the. finished opening The tool will be fed constantly forward as it is rotated and eventual-l'ythe cutting edge 12 will be brought into contact with the surface of the floor and will begin: to shave therefrom a portion of the wood between the tooth 14 and the opening 15; V The. cutting away otthe wood will thus be performed progressively and, there fore, the-tendency o-t thewoo'd to chip-and splinter at the wall of the opening, is overcome. and a clean out opening isproduced uickl and with a minimum expenditure; of

labor; V

The set screw or bolt 7,. of course, binds the base member 8 of the cutter within the opening 5 of the tool head, and the incliuation of thisxbase member together with the inclination of the wall of the opening 5 in whichthe said memberis received will effect a wedging, action otthebase against the end of theset: bolt or screw under the resistance encountered by the cutter when the tool is operated. Within the limits of the length of the base member 8', the cutter may be ad justed radially so, that openings of different diameters may be formed, and this capabilityotthe-device to produce openings of various diameters may-be increased by pro viding a plurality of interchangeable: cutters of d'iiierent lengths; The inclination of the opening 5, through the'head' 3 also facilitates the clearance of shavings and sawdust therefrom. 1

In Fig. 5 I have, shown a longitudinal groove l6giiorm'edexteriorly in the threaded extremity 4 of the head 3, thereby reducing the weight ot the device and also reducing the extent of surface which creates frictional resistance between the head and the bore of the; opening 15, so as to facilitate'rotation of the tool. It is to be particularly noted that the set screw or bolt by which the cutter is secured in the head is disposed at the lower extremity'of the head along'the axis of the same so that it oli ers no resistance tothe in sertion of the tool in the previously formed thereof V i boring and reaming tool comprising Moreover, by

to gouge the wall of the bore or opening'15 and thereby resist the operation of the tool and subject the same to jerks and stops which tend to cause chipping and splintering of the wall of the completed opening. The tool is exceedingly simple and may be produced at a very low cost. 7

Having thus described the invention, I claim: 7

1. A boring and reaming tool comprising a substantially cylindrical head having its lower portion exteriorly threaded and adapted to be inserted ina previously formed opening, said head having a transverse-open in-gtherethrough piercing the threads and. having its lower end iiat'andsmooth; and provided. with an axial bore communicating with said transverse opening, a'c'utter barhaving a cylindrical stock fitted Withinthe openingv and provided with a flat. surface, and a set screw threaded in thebore andih'aving' its outer end provided with atoOLen-gaginghead and its inner end adapted to. clamp the cylindrical stock. at, the flat. surface.

a substantially. cylindrical head having. itsv lower portion exteriorlythreaded and adapt-1 ed tozbe inserted in a previously termed opening, said head having a downwardly .inclined transverse: opening therethrough piercing.v the threads and having its lower end straight and-fiat and pierced by an axial bore communicating, witlr said transverse:

opening, a cutter bar fitting within the trans; verse opening and including a cylindrical stock having its circumferential surfacedisposed angularly with respect to its ends to conform to the inclination of the wall of' the transverse opening, said cylindricalstock being provided with a fiat surface, and a set screw threaded in the walls of the axial bore and adapted to engage the flatssurface oi the cylindrical stock of the cutter, the outer end;

of the set screw being providedjwith toolengaging head normally spaced from the flat lower end ofthe cylindrical head.

1. A; boring bit comprising a substantiallycylindrical head h-avingits lower portion formed with threads whereby-to provide for feeding of the head-through an opening in. the work in the rotation of the bit, the said threaded portion of the head having ajdiametric cylindrical opening. formed therein and inclined downwardly toward one-side oithe head, a cutter bar having a substantially cylindrical stock fitted in said opening and; having a flat underside, anda set screw threaded axially into the lower-end of the head and binding'at its upper end against thefiat under side ofthe said stock and securing the same in a definite fixed position within the opening, the cutter bar extendin radially from the said side of the head an I having its upper side'beveled' to meet the plane of the'nnder side of the bar and prc vide a cutting edge inclined downwardly on a continuous straight line to the outer end ofthe bar, the said under side o'f the bar' being inclined upwardl and rearwardly from the under side" of the bar.

under side of the stock; the said barebeingfl bodily inclined downwardly with relation to Y the head and being provided'at its said outer 1o 1 end. with a thin cuttingblade I, depending In testimony whereof I afl'ix my signatu e.

EVERTON SQWALRATH. w 

